He furrowed his eyebrows, “I thought.. You could sterilize anything with like boiling water or bleach. Has anything ever been so sticky it wouldn’t come off?”

Carlos smiled slightly at Magnus. “Well… some substances are very stubborn. And we can’t use bleach, because mixing bleach with other chemicals… well, sometimes bad things can happen. So, that’s a no. And yeah, usually oils and such things would be too sticky to get rid of sometimes.”